Rotary drill.



K. K. FElNAIGLE.

ROTARY DRILL.

APPLICATION FILED MAY 1, 1914.

1,156,001. Patented Oct. 1915.

lmuamtoz KARL K. FEINAIGLE, OFCHEROKEE, IOWA.

ROTARY DRILL.

Specification of LettersPatent.

Patented Oct. 5,1915.

Application filed May 7, 1914. Serial N 0. 837,022.

T 0 all whom it may concern."

Be it known that I, KARL'K. FEINAIGLE, a subject of the Emperor of Germany, residing at Cherokee, in the county of Cherokee and State of Iowa, have invented certain new and useful Improvements in R0- tary Drills, of which the following is a specification.

This invention relates to certain improve ments in drilling and boring and more particularly relates to drills; and the objects and natureof the invention will be readily understood by those skilled in the art in the light'of the following explanation of the accompanying drawing illustrating what I now believe to be the preferred embodiment or mechanical expression of my invention from among other forms, constructions and arrangements within the spirit and scope thereof.

An object of the invention is to provide improved means for automatically lifting or removing the drill bit from the hole when the rotation of the drill shaft ceasesand for automatically feeding said shaft and the bit to the work as the shaft is rotated.

A further object of the invention is to provide an improved automatic drill bit feeding and withdrawing device particularly applicable to bench drills whereby the drill bit is normally located at its limit of upward movement and is automatically returned to such limit when the bit ceases to rotate.

A further object of the invention is to provide a bench drill with a centrifugal feeding device for the longitudinally slidable rotary drill shaft controlled by the rotation of said shaft to constantly press the shaft forward to holdthe drill bit to work so long as the shaft is being rotated at the required speed.

A further object of the invention is to provide a drill having a freely longitudinally movable rotary shaft adapted to rotate and feed the drill bit with a weighted device acting by gravity to yieldingly hold said shaft at its limit of upward movement and acting by centrifugal force when the shaft is rotated to feed said shaft downwardly and hold the bit to its work.

The invention consists in certain novel features in construction and in combinations and arrangements as more fully and particularly set forth and pointed out herein- 5 after.

Referring -to the accompanying drawings;Figure 1*,is an elevation of a bench drill embodying my invention, certain parts being shown. in vertical section, full lines showing the parts in normal inoperative positions as when the shaft is at rest, dotted lines showing certain parts in operating positions. Fig. 2, is a detail perspective of certain parts.

In the drawings, I show a bench drill comprising a supporting frame 'or bracket 1, having a suitable fastening clamp 2, and work supporting table 3. The bracket or support extends upwardly from the clamp and at its upper end forms a vertically arranged open loop or yoke 4, within which is located the gearing for rotating the drill shaft. For instance, I show horizontal rotary drive shaft 5, extending through and mounted in one of the vertical sides of said yoke. and at its outer endprovided with operating handle 6, and at its inner end'provided with gear wheel 7, meshing with pinion 8, arranged on the drill shaft.

The vertical drill shaft 9, is provided at its lower end with a chuck 10, or any other suitable means, to receive and hold the drill bit 11. This shaft extends through suitable vertical bearing or guide openings in the upper and lowerends of the yoke 4, and also through a vertical bearing sleeve or box 12, arranged within the yoke and carried by an arm forming a part thereof. The drill shaft is freely movable or slidable longitudinally through said bearings provided there-' for in the frame and is also freely rotatable therein. The rotary vertical hub 13, of the pinion 8, is arranged between the lower end of the sleeve 12, and the upper end of the bearing box for the shaft in the lower end of the yoke, and is thereby held against sub-, stantial vertical movement while free to rotate. The drill shaft is freely slidable longitudinally through said hub and is rotated thereby through the medium of radial inwardly projecting pin or projection 14, carried by and rotating with the hub and taking into longitudinal slot or groove 15, in the shaft, whereby the shaft rotates with the hub but is free to move up and downthrough the same. 7

Suitable mechanism is provided to overcomethe weight of the ,drill shaft and parts carried thereby and to lift said shaft and yieldinglyuphold the same at its elevated inoperative position when at rest and to automatically lift the shaft from depressed operative position to such inoperative posiend of the shaft and at their lower free ends are provided with weights 22. Intermediate their ends, said levers are fulcrumed by cross pins 24, to the upper ends of downwardly converging links 23, at their lower ends pivotally joined by cross pins 25 to diametrically opposite upper end portions of a rotary hub or sleeve 27, carried by the upper end of the frame. The shaft passes loosely through said hub 27, and is freely movable vertically therein although the shaft and hub rotate together. The upper end of the drill frame or bracket isshown formed with a socket 28, concentric with the shaft and receiving the lower end of the hub 27 and supporting ball bearing 29, upholding the hub 27, and receiving the downward thrust thereof. The lower end of the hub, in this instance, is shown formed with an annular exterior flangeBl, on which balls '32,rest to sustain the upward thrust of the hub. The upward thrust of the balls 32, is

sustained by removable ring or plate 30, overhanging the bearing socket in the bracket and removably secured to the bracket and confining the hub therein. When the drill shaft is at rest the lower or free ends of the levers areheld at their limits of downward movement by the weights thereon and consequently the upper ends of the levers and the drill shaft are held at their limits of upward movement. When the drill shaft. is rotated at the required speed to operate the drill bit, the weights under centrifugal action will swing the levers to depress the upper ends thereof and thereby force the drill shaft down and hold the drill bit to its work constantly feeding the shaft down pressed and the rate at which the drill 'bit isfed forward in the work can be easily controlled by the operator in varying the speed at which the drive shaft is driven.

The weighted levers are rotated by the drill shaft through the pivotal coupling between the upper ends of said levers and said shaft, and the hub swiveled to the upper end of the drill supporting frameis rotated with said levers .through the medium of the fulcrum links 23.

What I claim is l. A rotary drill comprising a supporting frame, a vertical longitudinally-movable rotary drill shaft, means for rotating said shaft and permitting free vertical movement thereof, said frame having an opentop socket in its upper end, a rotary vertical hub concentric with said shaft and through which the same is freely movable vertically, said hub having its lower end arranged in said socket and formed with an enlargement, thrust bearings in said socket above and below said enlargement to re ceive the vertical thrust of said hub, a cap removably secured to the frame over said socket to removably confine the hub therein, opposite vertically-swingable levers weighted at the lower free ends and at their upper ends directly pivoted to the upper end of saidshaft and rotated'thereby, and vertically swingable fulcrum links to which said levers are fulcrumed, said links being pivoted to said hub and rotating the same.

2. A rotary drill comprising a supporting frame, a vertical longitudinally movable rotary drill shaft, means for rotating said shaft and'permitting free vertical movement thereof, said frame having an open top socket in its upper end, a rotary vertical hub arranged in said socket concentric with said shaft and through which the same is freely movable vertically, ball bearings in said socket for said hub to receive the vertical thrust of said hub, a'cap removably secured to the frame over said socket to removably confine the hub therein, and weighted centrifugal levers for supporting said shaft and for feeding and elevating the same, said levers being connected to said shaft and to said hub and rotated by said shaft and rotating said hub, substantially as described.

' In testimony whereof l affix my signature in presence of two witnesses.

KARL K. FETNATGLE. Witnesses:

W..R. HALLBAUER, R. ROBERTS. 

